From cb0b8442f0fb3ea155e61f46be62d92c9115d362 Mon Sep 17 00:00:00 2001
From: lat9nq <22451773+lat9nq@users.noreply.github.com>
Date: Fri, 4 Aug 2023 14:54:57 -0400
Subject: gl_device: Filter more specifically for slow ASTC

Adds a check to find if the renderer is Intel DG (i.e. DG2).

gl_device: Detect Mesa to disable their ASTC

In our testing, our own ASTC decoder has shown itself to perform faster
than the included one from the driver. Disable theirs when Mesa is
detected.

Mesa detection depends on the vendor string. Some drivers never appear
outside of *nix contexts, so only check those in the *nix context.

gl_device: Internalize Intel DG detection
---
 src/video_core/renderer_opengl/gl_device.cpp | 43 +++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/video_core/renderer_opengl/gl_device.cpp b/src/video_core/renderer_opengl/gl_device.cpp
index ee140c9c2..94258ccd0 100644
--- a/src/video_core/renderer_opengl/gl_device.cpp
+++ b/src/video_core/renderer_opengl/gl_device.cpp
@@ -106,6 +106,43 @@ bool IsASTCSupported() {
     return true;
 }
 
+static bool HasSlowSoftwareAstc(std::string_view vendor_name, std::string_view renderer) {
+// ifdef for Unix reduces string comparisons for non-Windows drivers, and Intel
+#ifdef YUZU_UNIX
+    // Sorted vaguely by how likely a vendor is to appear
+    if (vendor_name == "AMD") {
+        // RadeonSI
+        return true;
+    }
+    if (vendor_name == "Intel") {
+        // Must be inside YUZU_UNIX ifdef as the Windows driver uses the same vendor string
+        // iris, crocus
+        const bool is_intel_dg = (renderer.find("DG") != std::string_view::npos);
+        return is_intel_dg;
+    }
+    if (vendor_name == "nouveau") {
+        return true;
+    }
+    if (vendor_name == "X.Org") {
+        // R600
+        return true;
+    }
+#endif
+    if (vendor_name == "Collabora Ltd") {
+        // Zink
+        return true;
+    }
+    if (vendor_name == "Microsoft Corporation") {
+        // d3d12
+        return true;
+    }
+    if (vendor_name == "Mesa/X.org") {
+        // llvmpipe, softpipe, virgl
+        return true;
+    }
+    return false;
+}
+
 [[nodiscard]] bool IsDebugToolAttached(std::span<const std::string_view> extensions) {
     const bool nsight = std::getenv("NVTX_INJECTION64_PATH") || std::getenv("NSIGHT_LAUNCHED");
     return nsight || HasExtension(extensions, "GL_EXT_debug_tool") ||
@@ -120,12 +157,16 @@ Device::Device(Core::Frontend::EmuWindow& emu_window) {
     }
     vendor_name = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
     const std::string_view version = reinterpret_cast<const char*>(glGetString(GL_VERSION));
+    const std::string_view renderer = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
     const std::vector extensions = GetExtensions();
 
     const bool is_nvidia = vendor_name == "NVIDIA Corporation";
     const bool is_amd = vendor_name == "ATI Technologies Inc.";
     const bool is_intel = vendor_name == "Intel";
 
+    const bool has_slow_software_astc =
+        !is_nvidia && !is_amd && HasSlowSoftwareAstc(vendor_name, renderer);
+
 #ifdef __unix__
     constexpr bool is_linux = true;
 #else
@@ -152,7 +193,7 @@ Device::Device(Core::Frontend::EmuWindow& emu_window) {
     has_vertex_viewport_layer = GLAD_GL_ARB_shader_viewport_layer_array;
     has_image_load_formatted = HasExtension(extensions, "GL_EXT_shader_image_load_formatted");
     has_texture_shadow_lod = HasExtension(extensions, "GL_EXT_texture_shadow_lod");
-    has_astc = IsASTCSupported();
+    has_astc = !has_slow_software_astc && IsASTCSupported();
     has_variable_aoffi = TestVariableAoffi();
     has_component_indexing_bug = is_amd;
     has_precise_bug = TestPreciseBug();
-- 
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